u3742bm ATMEL Corporation, u3742bm Datasheet - Page 29

• Manufacturer Part Number: u3742bm
• Description: Uhf Ask/fsk Receiver
• Manufacturer: ATMEL Corporation

Electrical Characteristics (Continued)
All parameters refer to GND, T
wise specified. (V
4735A–RKE–11/03
Sensitivity variation FSK for the full
operating range compared to
T
Sensitivity variation FSK for full
FSK frequency deviation
Parameters
operating range including IF filter
compared to T
S/N ratio to suppress inband noise
signals
Dynamic range RSSI amplifier
Lower cut-off frequency of the data
filter
Recommended CDEM for best
performance
Recommended CDEM for best
performance
Maximum edge-to-edge time period of
the input data signal for full sensitivity
Upper cut-off frequency data filter
Minimum edge-to-edge time period of
the input data signal for full sensitivity
Reduced sensitivity
amb
= 25 ° C, V
S
amb
= 5 V
= 25 ° C, V
S
= 5 V, T
S
= 5 V
amb
amb
= 25°C)
= -40°C to +105°C, V
Test Conditions
f
f
P
f
f
f
P
The sensitivity of the receiver is higher
for higher values of D f
BR_Range0
BR_Range1
BR_Range2 and BR_Range3 are not
suitable for FSK operation
ASK mode
FSK mode
ASK mode
BR_Range0 (Default)
BR_Range1
BR_Range2
BR_Range3
FSK mode
BR_Range0 (Default)
BR_Range1
BR_Range2 and BR_Range3 are not
suitable for FSK operation
BR_Range0 (Default)
BR_Range1
BR_Range2
BR_Range3
Upper cut-off frequency programmable
in 4 ranges via a serial mode word
BR_Range0 (Default)
BR_Range1
BR_Range2
BR_Range3
BR_Range0 (Default)
BR_Range1
BR_Range2
BR_Range3
R
input matched according to Figure 6
f
in
IF
in
IF
IF
cu_DF
FSK
FSK
Sense
= 433.92 MHz/315 MHz
= 433.92 MHz/315 MHz
= 1 MHz
= 0.86 MHz to 1.14 MHz
= 0.82 MHz to 1.18 MHz
= P
= P
connected from pin Sens to V
=
Ref_FSK
Ref_FSK
2 p
---------------------------------------------------------- -
´
´
+ D P
+ D P
30 k W
1
Ref
Ref
S
FSK
= 4.5 V to 5.5 V, f
´
CDEM
S
,
Symbol
SNR
SNR
P
0
D R
CDEM
CDEM
D P
D P
f
t
t
D f
Ref_Red
cu_DF
ee_sig
ee_sig
= 433.92 MHz and f
f
FSK
RSSI
u
Ref
Ref
ASK
FSK
Min.
+2.5
+5.5
+7.5
0.11
13.6
2.5
4.3
7.6
20
20
10
2
0
Typ.
0.16
17.0
8.2
3.1
5.4
9.5
= 315 MHz, unless other-
30
30
60
39
22
12
27
15
U3742BM
Max.
1000
0.20
11.4
20.4
-1.5
-1.5
-1.5
560
320
180
270
156
3.7
6.5
50
50
12
89
50
3
(peak
level)
dBm
Unit
kHz
kHz
kHz
kHz
kHz
kHz
kHz
dB
dB
dB
dB
dB
dB
nF
nF
nF
nF
nF
nF
µs
µs
µs
µs
µs
µs
µs
µs
29